Why is the yellow oil light on in a Passat?

1 Answers
Aliyah
07/29/25 10:39pm
Possible reasons for the oil light being on in a Passat B5 include: insufficient oil pump pressure, faulty oil pressure sensor, lack of lubricating oil, wiring issues, or other component failures. Introduction to Engine Oil: Engine oil, also known as engine lubricant, serves multiple functions such as lubrication and friction reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, and shock absorption. Precautions for Using Engine Oil: When selecting engine oil, it should be chosen based on the engine's requirements, ensuring compatibility. Multi-grade oil is recommended due to its advantages in fuel efficiency, longevity, and effectiveness, providing better protection for the engine. The oil level should be slightly below the mark on the dipstick and not overfilled.
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